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3.7 Cooling Areas

Cleaning the Air Intake/Cooling Areas

To prevent generator shutdown or damage because of

overheating, keep the cooling air inlets clean and

unobstructed at all times. At the intervals specified in the

service schedule, check and/or clean the cooling areas.

Cleaning Procedure

1. Remove the blower housing and other cooling

shrouds.

2. Clean the cooling fins and external surfaces as

necessary.

3. Reinstall the cooling shrouds and blower housing.

3.8 Ignition System

Service the spark plug at the interval specified in the

service schedule using the following procedure.

Problem/Condition

Gap-bridged spark plug

Oil-fouled spark plug

Carbon-fouled spark plug

Lead-fouled spark plug

Preignition-damaged spark plug

Overheated spark plug

Worn spark plug

Figure 3-4 Engine Evaluation Using Spark Plug Condition

TP-6081 4/00

Spark Plug Service Procedure

1. Remove the spark plug wire by grasping the spark

2. Use compressed air to remove dirt from around the

3. Loosen the spark plug with a ratchet and 5/8 in.

4. Remove the spark plug and examine it. A spark

Means of Identification

Built-up deposits and gap between the

electrodes closing

Wet, black deposits on the insulator

shell, bore, and electrode

Black, dry, fluffy carbon deposits on the

insulator tips, exposed shell surfaces,

and electrodes

Dark gray, black, yellow, or tan deposits;

a glazed coating on the insulator tip

Melted electrodes and possibly blistered

insulator. Metallic deposits on the

insulator suggest internal engine

damage

White or light gray insulator with small

black or gray/brown spots with bluish

(burned) appearance on the electrodes

Severely eroded or worn electrodes

plug boot and turning it slightly while pulling. Do not

pull the wire. Pulling on the wire rather than the

boot may damage the wire or the terminal.

spark plug to prevent dirt particles from falling into

the combustion chamber.

spark plug socket with a rubber insert to prevent

spark plug damage.

plug in good operating condition will have a light tan

or gray deposit on the firing tip. See Figure 3-4 to

evaluate the engine condition by color/condition of

a problem spark plug.

Possible Cause

Oil or carbon fouling. Clean and regap

the spark plug.

Excessive oil entering the combustion

chamber through the worn rings and

pistons, excessive clearance between

valve guides and stems, or worn or

loose bearings. Replace the spark plug.

Incorrect spark plug, weak ignition,

clogged air intake, defective fuel pump,

overrich fuel mixture, or excessive

no-load operation. Clean and regap the

spark plug.

Caused by highly leaded fuel. Replace

the spark plug.

Wrong type of fuel, incorrect timing or

advance, too hot a plug, burned valves,

or engine overheating. Replace the

spark plug.

Engine overheating, wrong type of fuel,

loose spark plug, too hot a plug, low fuel

pump pressure, or incorrect ignition

timing. Replace the spark plug.

Caused by normal wear and failure to

replace spark plug at prescribed

interval. Replace the spark plug.

Section 3 Scheduled Maintenance